Recent content by MilesReid

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    Proving That a Lorentzian Structure Cannot be Put on S^2

    It is fairly easy to prove that each manifold can be given a Riemannian structure. The argument is standard: locally you give the riemannian structure and then you use partions of unity. This proof breaks down for signed metrics. Even for a manifold requiring only two charts. For example, I've...
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